Counting Cards - Chris Taylor
A teaching aid that uses simple graphic designs on cards to represent different place values and numbers, from 1 up to one million, for teaching addition, subtraction, multiplication, division, and place value concepts. The site offers a teachers guide,
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Creative Java Puzzles - J. L. Read, Enchanted Mind
Games "good for exercising both sides of the brain." Knight's Tour: pass all the squares of the board with the knight, making only legal moves. Peg Solitaire: Remove all the pegs in the least amount of time, finishing with only one peg in the target hole.
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Cube-It - Education Development Center, Inc. (EDC)
A math group activity: you will need fifty cubes per group. Gather sugar cubes, wooden cubes, units from Dienes blocks or Cusinaire rods, or any manipulative that has a cubical shape. Students will: estimate the dimensions of the largest cube that can
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Cube Roll - Cary and Michael Huang
Use the arrow keys to steer a cube along a path of squares towards a final square. Each successive level poses new restrictions based on which faces of the block can or cannot roll onto the square path, making a game out spatial thinking of polyhedral
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Delta Blocks - Hop David
A way to model different 3-D tessellations and a tool for studying geometry, crystallography, and polyhedra. Delta blocks were inspired by M. C. Escher's print "Flatworms," which he said demonstrates that one can build a house not only with the usual
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Digi-Block - Digi-Block, LLC
Manipulatives for K-4 classrooms. Students pack individual blocks into holders to create larger blocks of 10, 100, and 1,000, exploring place value and operations and learning the base 10 number system visually and physically.
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Domebook - Tom Camilli
Cardboard and transparent plastic geodesic domes built by children. Students start by constructing paper models, then apply scale factors to construct domes of any size using cardboard or wooden dowels and plastic sheeting. See pictures of classroom projects;
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Dominoes Activity - Suzanne Alejandre
A classroom activity (similar to Pentomino + 1 = Hexomino; a variation on polyominoes) aligned to the NCTM and California Standards, to be explored through manipulatives (paper dominoes). Students explore whether it is possible to cover a 6x5 grid with
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Education by Design
Publishers of educational software, focusing on special needs software for Windows and Macintosh that can be accessed with keyboard, mouse, and especially with IntelliKeys, Touch Windows or with switches. Math titles include MathPad, an arithmetic tutorial
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Educ-Easy Books - Gisela Hausmann
The "Hands on Mathematics" CD-ROM books offer teachers hands-on exercises using household items for teaching basic mathematics. Both CD-ROM books include worksheets which can be printed off the computer. Five FREE lesson plans available for visiting
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The Elverson Puzzle Co., Inc.
The creators of Jacob's Revenge, the classic wine bottle puzzle. Elverson Puzzle also makes a Tangram Puzzle, the eleven tiles of which form a 6 inch diameter circle; Farkle, a game played with extra large wooden dice or online, with the dice roller that
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Evil Mad Science - Evil Mad Science LLC
Producers of do-it-yourself (DIY) and open-source hardware designs in support of art, education, and accessibility. See, in particular, the d20 and d12 Handbags of Holding Kits (zippered bags in the shape of dodecahedra and icosahedra) and the kit for
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ExploreLearning.com - ExploreLearning
A library of virtual manipulatives called "Gizmos", primarily for grades 3-12, in math and science. Math topics include the major strands of instruction according to national standards, as well as developmental math, college algebra and college-level
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